Different algal symbionts explain the vertical distribution of dominant reef corals in the eastern Pacific

Proc Biol Sci. 2004 Aug 22;271(1549):1757-63. doi: 10.1098/rspb.2004.2757.


Symbiotic reef corals occupy the entire photic zone; however, most species have distinct zonation patterns within the light intensity gradient. It is hypothesized that the presence of specific symbionts adapted to different light regimes may determine the vertical distribution of particular hosts. We have tested this hypothesis by genetic and in situ physiological analyses of the algal populations occupying two dominant eastern Pacific corals, over their vertical distribution in the Gulf of California. Our findings indicate that each coral species hosts a distinct algal taxon adapted to a particular light regime. The differential use of light by specific symbiotic dinoflagellates constitutes an important axis for niche diversification and is sufficient to explain the vertical distribution patterns of these two coral species.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptation, Physiological / physiology*
  • Animals
  • Anthozoa / microbiology*
  • Base Sequence
  • Cluster Analysis
  • Dinoflagellida / genetics
  • Dinoflagellida / physiology*
  • Fluorescence
  • Light*
  • Molecular Sequence Data
  • Pacific Ocean
  • Polymorphism, Restriction Fragment Length
  • RNA, Ribosomal, 5.8S / genetics
  • Sequence Analysis, DNA
  • Species Specificity
  • Symbiosis*


  • RNA, Ribosomal, 5.8S